package com.hmdp.interceptor;

import cn.hutool.core.bean.BeanUtil;
import cn.hutool.core.util.StrUtil;
import com.hmdp.dto.UserDTO;
import com.hmdp.utils.UserHolder;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.web.servlet.HandlerInterceptor;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.util.Map;
import java.util.concurrent.TimeUnit;

import static com.hmdp.utils.RedisConstants.LOGIN_USER_KEY;
import static com.hmdp.utils.RedisConstants.LOGIN_USER_TTL;

/**
 * @author: yp
 * @Description:
 * @creat:2022/10/21/10:06
 */
public class RefreshTokenInterceptor implements HandlerInterceptor {

    private StringRedisTemplate stringRedisTemplate;

    public RefreshTokenInterceptor(StringRedisTemplate stringRedisTemplate) {
        this.stringRedisTemplate = stringRedisTemplate;
    }

    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
//     TODO   1.获取请求头中的token
        String token = request.getHeader("authorization");
        if (StrUtil.isBlank(token)) {
            return true;
        }
//     TODO   2.基于token获取redis中的user
        String tokenKey = LOGIN_USER_KEY + token;
        Map<Object, Object> entries = stringRedisTemplate.opsForHash().entries(tokenKey);
//        3.判断用户是否存在
        if (entries.isEmpty()){
            return true;
        }
//      5.将查询到的hashMap数据转换成usrDTO
        UserDTO userDTO = BeanUtil.fillBeanWithMap(entries, new UserDTO(), false);
//        6.存在就保存到ThreadLocal中
        UserHolder.saveUser(userDTO);

//    7. 刷新token
        stringRedisTemplate.expire(tokenKey,LOGIN_USER_TTL, TimeUnit.MINUTES);
//        8.放行

        return true;
    }


    @Override
    public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {
        UserHolder.removeUser();
    }
}
